131128615 has 4 divisors (see below), whose sum is σ = 157354344. Its totient is φ = 104902888.

The previous prime is 131128609. The next prime is 131128651. The reversal of 131128615 is 516821131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131128615 - 2⁵ = 131128583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13112857 + ... + 13112866.

It is an arithmetic number, because the mean of its divisors is an integer number (39338586).

Almost surely, 2^131128615 is an apocalyptic number.

131128615 is a deficient number, since it is larger than the sum of its proper divisors (26225729).

131128615 is an equidigital number, since it uses as much as digits as its factorization.

131128615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26225728.

The product of its digits is 1440, while the sum is 28.

The square root of 131128615 is about 11451.1403362285. The cubic root of 131128615 is about 508.0414630736.

Adding to 131128615 its reverse (516821131), we get a palindrome (647949746).

The spelling of 131128615 in words is "one hundred thirty-one million, one hundred twenty-eight thousand, six hundred fifteen".